Mass damper for solar tracker
In an example, the system has a mechanical isolator comprising an elastic material configured to separate the panel rail from the torque tube cause destructive interference with a natural resonant frequency of the system without the mechanical isolator to reduce a mechanical vibration of the system.
1. A method of operating a solar tracker system, comprising:
providing the solar tracker system comprising:
a first pillar and a second pillar;
a torque tube configured between the first pillar and the second pillar;
rails configured to support solar panels and coupled to the torque tube via clamps;
isolators, which include an elastic material, the isolators selectively coupled between the rails and the solar panels, wherein each isolator includes at least two closed portions defining at least one opening along a length of the isolator, and wherein the length and width of each of the at least two closed portions are not equal; and
causing destructive interference, using the isolators, with a resonant frequency of the solar tracker system.
2. The method of claim 1 ,
wherein each closed portion of the isolator includes a narrow region.
3. The method of claim 1 , wherein the isolators are configured to mechanically and electrically isolate the solar panels from the torque tube.
4. The method of claim 1 , wherein the resonant frequency ranges from 1 Hz to 10 Hz in a torsional mode and 1 Hz to 5 Hz in a bending mode.
5. The method of claim 1 , wherein the elastic material is selected from a group consisting of a rubber material and a polymer material.
6. The method of claim 1 , wherein the mechanical vibration leads to failure of the solar tracker system without the isolators.
7. The method of claim 1 , wherein the isolators include different stiffnesses to tune a mass and an inertia of the solar tracker system to reduce the mechanical vibration.
8. The method of claim 1 , wherein the mechanical vibration includes a torsional mode and a bending mode.
9. The method of claim 1 , wherein the mechanical vibration is at least partially caused by external wind.
10. The method of claim 1 , wherein the rail includes a first side coupled to an edge of a first solar panel and a second side coupled to the isolator, the second side having a second side height and the mechanical isolator having a thickness, the second side height and the thickness being substantially equal to a first side height of the first side, the mechanical isolator being coupled to an edge of a second solar module.
11. The method of claim 10 , further comprising a polymeric or rubber bumper provided between the first solar panel and the second solar panel.
12. A solar tracker comprising:
a torque tube;
rails coupled to the torque tube and configured to support solar panels; and
isolators, which include an elastic material, selectively coupled between the rails and the solar panels so as to cause destructive interference with a resonant frequency of the solar tracker,
wherein the isolators are defined by a height a thickness, and a length having opposite end portions
wherein each isolator includes a narrow region along a center of the height and the thickness of the isolator in relationship to each edge region of the isolator, and
wherein each isolator includes a pair of flanges through which the isolator is coupled between a rail and a solar panel at each end portion.
13. The solar tracker of claim 12 , further comprising:
a pair of piers configured to support the torque tube;
a clamp assembly coupled to a first side of the torque tube; and
an offset drive coupled to a second side of the torque tube.
14. The solar tracker of claim 13 , wherein the isolator is provided in a center solar panel spatially disposed on a panel bank including solar modules coupled to the torque tube.
15. The solar tracker of claim 14 , wherein the panel bank is configured between the pair of piers, each of the piers configured with a clamp assembly coupled to the torque tube.
16. The solar tracker of claim 15 , wherein the panel bank is one of multiple panel banks configured on a drive assembly coupled to the torque tube.
17. The solar tracker of claim 15 , wherein the other solar panels are free from an isolator.
18. The solar tracker of claim 15 , wherein the isolator includes a thickness of polymer or rubber material suitable to cause destructive interference and absorb vibration and shock for any resonance frequency of the solar tracker.
19. The solar tracker of claim 12 , wherein the isolator symmetrically flares out from the center to the edge regions of the isolator.
20. The solar tracker of claim 12 , wherein the isolator further includes a flange disposed at each of the edge regions of the isolator.